• 한국전자파학회지:전자파기술
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• 제24권2호
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• pp.35-50
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• 2013

This paper discusses effects of mesh planes on signal integrity in high-speed glass ceramic packages. One of serious signal integrity issues in high-speed glass ceramic packages is high far-end (FE) noise coupling between signal interconnects. Based on signal integrity analysis, a methodology is presented for reducing far-end noise coupling between signal interconnects in high-speed glass ceramic modules. This methodology employing power/ground mesh planes with alternating spacing and a via-connected coplanar-type shield (VCS) structure is suggested to minimize far-end noise coupling between signal lines in high-speed glass ceramic packages. Optimized interconnect structure based on this methodology has demonstrated that the saturated far-end noise coupling of a typical interconnect structure in glass ceramic modules could be reduced significantly by 73.3 %.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2001년도 종합학술발표회 논문집 Vol.11 No.1
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• pp.111-114
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• 2001

In this paper, the electromagnetic coupling problems are tackled on slots with nonzero thickness. The analysis is carried out by combination of the thin-wire concept and the Method of Moment(MoM) for the sake of improving computation efficiency. Under the conditions to be presented, slots can be replaced with wires that have effective radii. Also, the infinite summation-type Green's functions are calculated for the parallel-pale structure. A slot in an infinite ground is analyzed and its results are compared with the measurement in a literature. Furthermore, it is examined how the slots couple in parallel plates.

• Journal of electromagnetic engineering and science
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• 제4권3호
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• pp.102-106
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• 2004

A novel Genetic Algorithm(GA)-based method is suggested to transform a coupling matrix to another, without the procedure of Matrix Rotation. This can remove tedious work like pivoting and deciding rotation angles needed for each of the iterations. The error function for the GA is simply formed and used as part of error minimization for obtaining the solution. An 8th order dual-mode elliptic integral function response filter is taken as an example to validate the present method.

• 전자공학회논문지A
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• 제30A권2호
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• pp.10-15
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• 1993

The cylindrical TEM mode solution for electromagnetic coupling to an angled two-wire transmission line is corrected by imposing some physical constraints additionally. The validity of the correction process is assured by showing that the corrected solution approaches the numerical result for the equivalent model of cascaded piecewise uniform sections.

• 대한전자공학회논문지
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• 제26권8호
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• pp.1257-1261
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• 1989

The propagation of electromagnetic waves in a photorefractive crystal is considered. The electromagnetic waves(i.e. TE waves and TM, waves) incident upon the crystal at any incident angle are coupled with reflected waves due to the Fresnel's reflectance in the photorefractive crystal. This coupling leads to a nonreciprocal optical transmissivity. About some incident angles, the optical transmissivity of TE and TM waves in regard to the coupling strength is investigated.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.126-130
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• 2003

The optical power transfer of TM modes in grating-assisted directional couplers (GADCs) with three-guiding channels is rigorously evaluated by defining a novel coupling efficiency amenable to the rigorous analytical solutions of modal transmission-line theory (MTLT). The results reveal that the incident power is sensitively partitioned through three output channels in terms of such grating parameters as the period, the duty cycle, and wavelength.

• Journal of electromagnetic engineering and science
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• 제6권3호
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• pp.155-159
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• 2006

An efficient method is presented to design filters without the similarity transform of their coupling coefficient matrix as circuit parameters, which is very tedious due to pivoting and deciding rotation angles needed during the iterations. The transfer function of a filter is directly used for the design and its desired form is derived by the optimized rational-function fitting technique. A 3rd order coaxial lowpass filter is taken as an example to validate the proposed method.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2002년도 종합학술발표회 논문집 Vol.12 No.1
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• pp.389-393
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• 2002

• 한국전자파학회논문지
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• 제14권6호
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• pp.599-605
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• 2003

이중모드 비대칭 canonical 구조 필터는 일반적으로 위성 중계기의 입력 멀티플렉서에 주로 사용된다. 본 논문에서는 비대칭형 canonical 필터의 용이한 합성 방법에 대하여 언급하였다. 비대칭형 canonical 필터의 결합행렬은 대칭형 canonical 필터의 결합 행렬로부터 평면 회전(plane rotation)과 같은 similarity transformation을 이용하여 구하였다. 비대칭형 canonical 필터의 결합 행렬을 구하기 위한 similarity transformation 과정에 있어서 회전 순서, 피벗(pivot), 회전각을 제시하였다. 본 논문에서 제시한 방법을 이용하여 8차 및 10차 비대칭 canonical filter의 결합 행렬을 추출하였으며, 비대칭형 canonical 필터의 주파수 응답 특성은 대칭형 canonical 필터의 주파수 응답 특성과 동일한 특성을 나타내었다.

• 한국전자파학회논문지
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• 제15권3호
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• pp.301-310
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• 2004

본 논문에서는 마이크로스트립 공진기에 엇갈린 슬롯과 한 쌍의 spur-line을 삽입한 소형 이중모드(dual-mode)여파기를 제안하였다. 제안한 여파기는 급전선과 공진기 사이에 존재하는 급전 갭(coupling gap)을 없앰으로써 삽입손실의 특성이 향상되었다. 엇갈린 슬롯만 가진 기존의 이중모드 여파기와 비교할 때, 엇갈린 슬롯과 spur-line을 동시에 갖는 이중모드 여파기는 이중모드 특성을 나타내는 섭동의 범위가 상당히 넓기 때문에 이중 모드 여파기의 설계가 용이해졌다. 또한, 제안된 구조의 가장자리에 존재하는 spur-line에 2개의 PIN다이오드를 삽입하여 개폐기 특성을 갖는 여파기로의 응용도 가능하였다. 또한 제안한 구조는 공진기에 삽입된 슬롯과 spur-line에 의해 전기적인 길이가 길어지므로 기존의 구조에 비해 34.7 %의 크기 감소 효과를 얻을 수 있었다.